Dado-cutter.



No. 811,681. PATENTED FEB. 6, 1906.

E. WISMAR. DADO CUTTER.

APPLICATION FILED AUG.16, 1904.

SATES DADO CUTTEH.

Specification of Letters Patent.

Patented Feb. 6, 1906.

Application filed August 16, 1904. Serial No. 220,975.

T0 on whom it may concern.-

Be it known that I, EMIL WISMAR, a citizen of the United States, residing at Los Angeles, in the county of Los Angcles and State of California, have invented new and useful Improvements in Dado-Cutters, of which the following is a specification.

It is the object of my invention to provide an expansible dado-cutter which is easily and cheaply made, has few parts, is easily expanded or contracted, andv the teeth of which can be easily filed without taking the cuttingwheels apart. I accomplish this object by means of the mechanism described herein, and shown in the accompanying drawings, in which- Figure 1. is a side view of my improved composite dado-cutter in which three .separate wheels of equal thickness at cutting edge are used. Fig. 2 is a transverse central section of the same. Fig. 3 is a side view of my improved dado-cutter in which. but two cuttingwheels are used. Fig. 4 is a central section of the same.

In the drawings, A represents the central hub, upon which the cutting wheels are mounted. This hub is made in two sections A and A which are screw-threaded and adapted to hold between them the central cuttingwheel B. The central portion of this central cutting wheel immediately surrounding the hub is comparatively thin. The teeth C, mounted on the periphery of the central cutting-wheel, are considerably thicker than the body portion thereof. On each endof the hub A are the screw-threaded cutting-wheels D andE. These cutting-wheels have cuttingteeth D and E, respectively, similar to the teeth on the central wheel, but overhang the bodyportion only on the inside and are flush on the outside of the body portion. I have shown four teeth upon each one of the outside cutting-wheels, shown in Fig. 1, and when assembled on the hub they are arranged equidistant from each other. On the central cutting-wheel B there are eight teeth C, and these teeth when the cutter is assembled are placed. in position, each one between a tooth, on both of the outside wheels. Thus it will be seen that the teeth on the inside cutting wheel will overlap those on the outside and fit in between them and will be driven thereby.

Now if it is desired to lessen the width of the cutter which is shown fully expanded in Fig. 2, the hub A is turned inside the cutting wheelsin a left-handed. direction. The outside cuttii1gwheels will then move toward each other, the thread 6 in the wheel Ebeing righthanded and the thread d in the wheel I) being left handed. The whole cutter is then mounted on the saw-arbor between the jamnuts (not shown) provided for holding the same. 011 the outside of the teeth I) of the outside wheel are mounted the saw-teeth F, which are designed to cut on the side of the groove being cut by the cutter and make a finish along the side-of the groove. These saw-teeth F are countersunk into the cutterteeth and are removably held in place by a set-screw F.

Figs. 3 and 4 are side and sectional views of a dado-cutter made up of two cutting-wheels K and H, mounted on. the central hub G. The cutter II is similar to the outside wheel shown in Figs. 1 and 2 and. is tightly screwed upon the hub G. Upon the hub G is mounted an exteriorly-threaded ring I, which is loosely held between the shoulders J and the cutting-wheel H and is revoluble on the hub. The wheel K is mounted on the ring I. Each of the cutting-wheels II and K has six teeth, the teeth of one wheel fitting in behind the teeth of the other, as in Fig. 3. These teeth are provided. with saw-teeth L, as in the cutter shown in Figs. 1 and 2. When it is de sired to contract or expand the cutter from the position shown in Fig. 4, the ring I is turned 011 the hub G, (a spanner-wrench hole I being provided in the ringfor that purpose, and the cutter K is moved to or from the cutting-wheel II, as the case may be. The cutter shown in Figs. 3 and 4 has a projecting hub on one side only, while the cutter shown in Figs. 1 and 2 has a hub on both sides. These can be used on work where it is desirable to have a cutter with a flush outer surface. In making a very thin cutter the teeth of the cutting-wheels will be so thin that there will not be metal enough for the screws L to hold securely. In this case the sawteeth are made in one piece with the cutterteeth, or the teeth are alternately cutter-teeth and saw-teeth.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A dado-cuttcr comprising a hub made in telescopic sections, wheels mounted on the sections, and means for adjusting the wheels with respect to each other on the sections.

2. A dado-cutter comprising a hub made in telescopic sections, and three wheels mounted on the sections, one of the Wheels held by and between the sections.

3. A dado-cutter comprising a hub made in telescopic sections, three wheels mounted on the sections, one of the wheels held by and between the sections, and the other two Wheels adjustable with respect to each other on the sections.

4. A dado-cutter comprising a hub made in telescopic sections which are internally and externally threaded, whereby to screw together, three wheels mounted on the sections, one of the wheels held by and between the sections.

5. A dado-cutter comprising a hub made in telescopic sections which are internally and externally threaded, whereby to screw together, three wheels mounted on the sections, one of the wheels held by and between the sections, and means for adjusting the other two wheels with respect to each other on the sections.

6. A dado-cutter comprising a hub comi posed of two sections adapted to partly telescope one another, a cutting-Wheel adapted to be held between the two sections, cutting- I wheels mounted on the sections, and cuttingteeth formed on the peripheries of the cut ting-wheels, said cutting-wheel disposed bei tween the cutting-wheels and being revoluble on the cutter-carrying hub.

7. The herein-described dado-cutter comprising the hub A composed of the members A and A adapted to partly telescope one over the other and hold a cutting-Wheel therebetween, the cutting-wheels D and E screwthreaded on their interior having on their periphery cutting-teeth D and E respectively and the cutter-carrying wheel B disposed between the cutting-wheels D and E and being 1 revoluble on the cutter-carrying hub, and the saw-teeth cutter F removably secured on the outer side of the cutter-tooth D.

8. In a dado-cutter of the character herein described a cutting-wheel-carrying hub A composed of the members A and A the member A having on one end thereof a threaded oiiset adapted for screw-threaded engagement in the screw-threaded socket in the member A, the member A of a central cutting-wheel having also a shoulder for the reception of the central cutting-Wheel substantially as herein shown and described.

In witness that I claim the foregoing I have hereunto subscribed my name this 10th day of August, 1904.

. EMIL WVISMAR. Witnesses:

HENRY T. HAZARD, G. E. HARPHAM. 

